Make SoX support uclibc-based toolchains, from:
http://sourceforge.net/p/sox/bugs/179/

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>

Index: sox-14.4.1/src/formats.c
===================================================================
--- sox-14.4.1.orig/src/formats.c
+++ sox-14.4.1/src/formats.c
@@ -409,7 +409,7 @@ static void UNUSED rewind_pipe(FILE * fp
 #if defined _FSTDIO || defined _NEWLIB_VERSION || defined __APPLE__
   fp->_p -= PIPE_AUTO_DETECT_SIZE;
   fp->_r += PIPE_AUTO_DETECT_SIZE;
-#elif defined __GLIBC__
+#elif defined __GLIBC__ && ! defined __UCLIBC__
   fp->_IO_read_ptr = fp->_IO_read_base;
 #elif defined _MSC_VER || defined _WIN32 || defined _WIN64 || defined _ISO_STDIO_ISO_H
   fp->_ptr = fp->_base;
@@ -417,7 +417,6 @@ static void UNUSED rewind_pipe(FILE * fp
   /* To fix this #error, either simply remove the #error line and live without
    * file-type detection with pipes, or add support for your compiler in the
    * lines above.  Test with cat monkey.wav | ./sox --info - */
-  #error FIX NEEDED HERE
   #define NO_REWIND_PIPE
   (void)fp;
 #endif
